Tasks: update

Alpha, new version and documentation available

A new v2 version of the Task Queue REST API is now available. Although Google will continue to
support the older v1 version until the end of 2017, we recommend that you use the new v2
version, which is renamed to Cloud Tasks API. Cloud Tasks will be
the new name for Task Queue. The v2 version is still in alpha. To use the new v2 version,
apply to be whitelisted for
the Cloud Tasks API. There are some differences, such as URL changes: see the
v1 to
v2 migration documentation for details. After you are whitelisted, you can use the new
Cloud Tasks API documentation.